Propellers unscrewing themselves

Hi, I’ve reached flight check one, and whenever I try to launch, the propeller unscrews itself from the force of the motor.

I’ve tried reversing the polarity of the motor, and that only changes when it unscrews. Clockwise it unscrews as soon as I launch, and counterclockwise it unscrews when the motors stop.

How can I keep the motors attached?

Update: we have a video!

Imgur link because I can’t post videos here directly:

The point where the propeller broke off was the exact point that I shut off motor power. Since it was only a one propeller test, leaving it on longer would have caused it to flip.

Update #2: We fixed it

It was literally just that we didn’t screw in the propellers tightly enough.

This is so sad.

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